Which explains why the graph is not a function?
It is not a function because the points are not connected
to each other.
It is not a function because the points are not related by a
single equation.
It is not a function because there are two different x-
values for a single y-value.
It is not a function because there are two different y-
values for a single x-value.

D.It is not a function because there are two different y-values for a single x-value.

Step-by-step explanation:

A function is a relation where each input(x) has a single output(y).

From the given graph we can see that there are 2 different values of y i.e. y=-2 and y=4 for single x=4.

Therefore, D is the right answer. The graph is not a function because it is not a function because there are two different y-values for a single x-value.